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The ratio of radii of the first three Bo...

The ratio of radii of the first three Bohr orbits of H-atom is :

A

`1:2:3`

B

`1:4:9`

C

`1:9: 27`

D

`1: sqrt(2) : sqrt( 3)`

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The correct Answer is:
B
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MODERN PUBLICATION-UNIT TEST 1 -SELECT THE CORRECT ANSWER
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  3. The ratio of radii of the first three Bohr orbits of H-atom is :

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  4. The ratio of difference in energy between the first and second Bohr or...

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  5. Among the following particles, which will have the shortest wavelength...

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  6. Which of the following sets of quantum number is correct for an electr...

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  7. The total number of spectral lines obtained in Lyman series when an el...

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  8. Atoms may be regarded as comprising protons, neutrons and electrons. I...

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  9. Which of the following statements regarding spectral series is correct...

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  10. As the atomic number of the halogens increases, the halogens :

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  11. Which of the following has largest size ?

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  12. Which of the following electronic configuration would you expect to ha...

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  13. The negative electron gain enthalpy values of halogens follows the ord...

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  14. Which of the following does not involve sp^(3) hybridisation of the ce...

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  15. The geometry of NF(5) molecule is :

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  16. Which of the following species does not exist ?

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  17. Which of the following has largest ONO bond ?

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  18. XeF(2) molecule is :

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  19. Which of the following has least hydrogen bonding ?

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  20. Which of the following is paramagnetic ?

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